DOC AIRBUS | AMM A320FInstallation of the MLG Lockstay Actuating Cylinder
TASK 32-11-21-400-001-A-02
Installation of the MLG Lockstay Actuating Cylinder
To install and test the MLG lockstay actuating cylinder with the lockstay brace tool (DRT68864) installed. It is not necessary to lift the aircraft on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Expendable Parts
D. Referenced Information
3. Job Set-up
Subtask 32-11-21-941-055-A
Subtask 32-11-21-420-053-A ** ON A/C NOT FOR ALL
Subtask 32-11-21-481-052-A
[Rev.10 from 2021]
2026.04.01 00:40:45 UTC
Installation of the MLG Lockstay Actuating Cylinder
WARNING:
MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobTo install and test the MLG lockstay actuating cylinder with the lockstay brace tool (DRT68864) installed. It is not necessary to lift the aircraft on jacks.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | AR | SAFETY BARRIER(S) |
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 4.5 and 2.9 m.N (39.82 and 25.66 lbf.in )  | |
| 460003180-51 | 1 | RING-KEEP |
| 460005171-95 | 1 | POST-ASSEMBLY |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.02ABA1) | Phosphate Ester Hydraulic Fluid-General Power - - |
| (Material No.06AAB1) | Polysulfide Sealant-General Purpose Fillet - |
| (Material No.06AAC5) | Polysulfide Sealant-General Purpose Interfay Landing Gear |
| (Material No.06ABF1) | Polysulfide Sealant-Fuel Tank Quick Curing - |
| (Material No.08BAA9) | Non Aqueous Cleaner-General - - |
| (Material No.14QFB1) | Wire-Locking Dia: 0.8 mm CRES Nickel Alloy - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | PACKINGS | AIPC 32-11-22-01-050 |
| 2 | BACK-UP PACKINGS | AIPC 32-11-22-01-060 |
| 3 | PACKINGS | AIPC 32-11-85-89-050 |
| 2 | BACK-UP PACKINGS | AIPC 32-11-85-89-060 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 29-00-00-210-001-A | Check for Air in the Green/Blue/Yellow Hydraulic System |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 29-14-00-614-001-A | Depressurization of the Hydraulic Reservoirs |
| TASK 29-23-00-860-001-A | Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 29-23-00-860-002-A | Connection of the Isolation Coupling of the Power Transfer Unit (PTU) |
| TASK 32-00-00-080-001-A | Removal of the Brace Tool from the Lockstay Actuator |
| TASK 32-00-00-480-001-A | Installation of the Brace Tool on the Lockstay Actuator |
| TASK 32-00-00-481-001-A | Installation of the Safety Devices on the Landing Gears |
| TASK 32-00-00-481-002-A | Installation of the Safety Devices on the Landing Gear Doors |
| TASK 32-31-00-720-007-A | Functional Test of the MLG Lockstay Actuating Cylinder with Brace Tool Installed |
MLG Lockstay Actuating-CylinderSubtask 32-11-21-941-055-A
A. Safety Precautions
(1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are installed on the landing gear and the landing gear doors (Ref. AMM TASK 32-00-00-481-001) and (Ref. AMM TASK 32-00-00-481-002).
(3) On panel 400VU:
Subtask 32-11-21-860-057-A (1) Make sure that the SAFETY BARRIER(S) are in position.
(2) Make sure that the ground safety locks are installed on the landing gear and the landing gear doors (Ref. AMM TASK 32-00-00-481-001) and (Ref. AMM TASK 32-00-00-481-002).
(3) On panel 400VU:
- Make sure that the landing-gear control-lever 6GA is in the DOWN position
- Make sure that a WARNING NOTICE(S) is in position to tell persons not to operate the landing gear.
B. Aircraft Maintenance Configuration
(1) Make sure that the safety device is installed on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
(2) Make sure that the applicable hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the applicable hydraulic system reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(5) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.
Subtask 32-11-21-869-058-A (1) Make sure that the safety device is installed on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
(2) Make sure that the applicable hydraulic systems are de-pressurized (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the applicable hydraulic system reservoir is depressurized (Ref. AMM TASK 29-14-00-614-001).
(4) Make sure that the isolation coupling of the PTU is disconnected (Ref. AMM TASK 29-23-00-860-001).
(5) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the applicable MLG lockstay actuating cylinder, at zone 731 or 741.
C. Flight Configuration Precautions
(1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
Subtask 32-11-21-865-057-A (1) If you did not open the LGCIU circuit breakers, make sure that the electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
D. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R33 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R32 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R32 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R31 |
Subtask 32-11-21-420-053-A ** ON A/C NOT FOR ALL
A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:
Subtask 32-11-21-420-053-B ** ON A/C NOT FOR ALL (1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:
WARNING:
DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
- FLUSH IT AWAY WITH CLEAN WATER
- GET MEDICAL AID.
CAUTION:
MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
(a) Lubricate the new AIPC 32-11-22-01-050 PACKINGS (3) and the new AIPC 32-11-22-01-060 BACK-UP PACKINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) . A. Preparation for Installation
(1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:
Subtask 32-11-21-420-054-A (1) Clean the component interface and/or the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the parts as follows:
WARNING:
DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:
- FLUSH IT AWAY WITH CLEAN WATER
- GET MEDICAL AID.
CAUTION:
MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.
(a) Lubricate the new AIPC 32-11-22-01-050 PACKINGS (3) or AIPC 32-11-85-89-050 PACKINGS (3) and the new AIPC 32-11-22-01-060 BACK-UP PACKINGS (2) or AIPC 32-11-85-89-060 BACK-UP PACKINGS (2) with Phosphate Ester Hydraulic Fluid-General Power - - (Material No.02ABA1) . B. Installation of the MLG Lockstay Actuating Cylinder
(1) Make sure that the DRT68864 LOCK, STAY BRACE TOOL (7) is installed on the applicable MLG (Ref. AMM TASK 32-00-00-480-001).
(2) Remove the blanking plugs from the hoses (1).
(3) Use the 460005171-95 POST-ASSEMBLY to install the new packings (3) and the new back-up packings (2) on the hoses (1).
(4) Use the 460003180-51 RING-KEEP to set the back-up packings (2) and the packings (3) in the grooves on the hoses (1).
(5) Attach the hoses (1) to the actuating cylinder (6) with the bolts (5) and the washers (4).
(6) TORQUE the bolts (5) to between 4.5 and 2.9 m.N (39.82 and 25.66 lbf.in ).
14QFB1 Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -
(8) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) or Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) to the heads of the bolts (5).
Subtask 32-11-21-860-058-A (1) Make sure that the DRT68864 LOCK, STAY BRACE TOOL (7) is installed on the applicable MLG (Ref. AMM TASK 32-00-00-480-001).
(2) Remove the blanking plugs from the hoses (1).
(3) Use the 460005171-95 POST-ASSEMBLY to install the new packings (3) and the new back-up packings (2) on the hoses (1).
(4) Use the 460003180-51 RING-KEEP to set the back-up packings (2) and the packings (3) in the grooves on the hoses (1).
(5) Attach the hoses (1) to the actuating cylinder (6) with the bolts (5) and the washers (4).
(6) TORQUE the bolts (5) to between 4.5 and 2.9 m.N (39.82 and 25.66 lbf.in )
. WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(7) Safety the bolts (5) with (8) Apply Polysulfide Sealant-General Purpose Interfay Landing Gear (Material No.06AAC5) or Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) to the heads of the bolts (5).
C. Aircraft Maintenance Configuration
(1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
Subtask 32-11-21-865-058-A (1) Connect the isolation coupling of the PTU (Ref. AMM TASK 29-23-00-860-002).
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 32-11-21-720-052-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R33 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R32 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R32 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R31 |
E. Test
(1) Do a functional test of the MLG Lockstay Actuating Cylinder (Ref. AMM TASK 32-31-00-720-007).
(2) Do a check for air in the Green Hydraulic-system (Ref. AMM TASK 29-00-00-210-001).
Subtask 32-11-21-865-059-A (1) Do a functional test of the MLG Lockstay Actuating Cylinder (Ref. AMM TASK 32-31-00-720-007).
(2) Do a check for air in the Green Hydraulic-system (Ref. AMM TASK 29-00-00-210-001).
F. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
Subtask 32-11-21-080-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R33 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R32 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R32 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R31 |
G. Removal of the Brace Tool
(1) Remove the DRT68864 LOCK, STAY BRACE TOOL (7) from the lockstay actuating cylinder (6) (Ref. AMM TASK 32-00-00-080-001).
Subtask 32-11-21-865-060-A (1) Remove the DRT68864 LOCK, STAY BRACE TOOL (7) from the lockstay actuating cylinder (6) (Ref. AMM TASK 32-00-00-080-001).
H. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
5. Close-up| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | L/G/LGCIU/SYS1/NORM | 1GA | C09 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R33 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R32 |
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LGCIU/SYS2 | 2GA | Q35 |
| 121VU | HYDRAULIC/LGCIU/SYS1/GRND SPLY | 52GA | Q34 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | LGCIU/BAT SPLY/SYS2 | 59GA | R32 |
| 121VU | LGCIU/BAT SPLY/SYS1 | 58GA | R31 |
Subtask 32-11-21-481-052-A
A. Installation of the Safety Equipment
(1) If necessary, install the safety device on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
Subtask 32-11-21-942-055-A (1) If necessary, install the safety device on the applicable MLG lockstay actuating cylinder (Ref. AMM TASK 32-00-00-481-001).
B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the WARNING NOTICE(S).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.